Back when people came to my house to play games, Area 51 was one of the games and it was only inverted and it took me about 30 minutes to adjust. I also always have inverted for aircraft. So, I can go either way.

I once tried switching to inverted just to see what it was like and never ended up switching it back and got used to it. So now I play all of my games with inverted controls. All of my friends make fun of me and ask how I could possible play like that haha